Drivability tuning tips?
06-07-2012, 12:59 PM
#1
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Drivability tuning tips? I've got a C5Z with livernois 243's 59-60cc, EPS/LXL 230/230 111+2, long tubes, no cats and a vararam. It put down 462/435 on a dyno dynamics dyno. We're having some problems with drivability. It wants to sputter on initial take off or when you're coming to a red light, you slow down, light turn green, put it in 2-3 depending on speed, get back on the gas it'll sputter for 2 seconds then come come back to life. Too rich, lean, timing? Any ideas fellas?
06-07-2012, 02:46 PM
#2
Might be burst knock retard spoiling the fun. Try zeroing out the table and see if that helps. If you data log during this happening, I bet you'll see the ignition timing drop a bunch. Otherwise, see what your fuel trims are doing at this rpm. If you haven't modified your VE tables, you're probably too rich a lower rpm.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
06-07-2012, 04:25 PM
#3
Have you considered a mechanical issue? can you post the tune? what software is it tuned with? can you post a log recorded showing the issue?
if it is boggy it is prolly rich, if it is bucky it is prolly lean. timing can make it do either buck or bog.
if it is boggy it is prolly rich, if it is bucky it is prolly lean. timing can make it do either buck or bog.
06-07-2012, 05:07 PM
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Defiantly not mechanical. I trust my tuner, just trying to get some ideas from others to look at. I'll let him know what you guys are saying and see what he thinks. Thanks guys!
06-07-2012, 09:45 PM
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adjusting timing does wonders too. tuning idle is actually harder than wot and take more time i hate when a customer asks me to do it haha. i give the job to a friend that wants to learn or something haha
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06-08-2012, 08:44 AM
#8
Launching!
99% of driveability issues are cleaned up when you follow a proper tuning procedure and spend some time doing steady state open loop mapping on a load bearing dyno at part throttle. If you (or your tuner) jumped right into WOT tuning without taking the time to do the steady state part load mapping, then it's not surprising that it made good numbers but struggles on transition.
You will find that if the injector data, VE surface, and MAF transfer function are all properly calibrated, a lot of the "driveability" issues just fall into place.
You will find that if the injector data, VE surface, and MAF transfer function are all properly calibrated, a lot of the "driveability" issues just fall into place.
